/*
 * Copyright (c) 2009 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.query.sql;

import java.math.BigInteger;

import com.mysema.query.types.operation.Ops;

/**
 * OracleTemplates is an SQL dialect for Oracle
 * 
 * tested with Oracle 10g XE
 * 
 * @author tiwe
 * @version $Id$
 */
public class OracleTemplates extends SQLTemplates {
    
    public OracleTemplates(){
        // type mappings
        addClass2TypeMappings("number(3,0)", Byte.class);
        addClass2TypeMappings("number(1,0)", Boolean.class);
        addClass2TypeMappings("number(19,0)", BigInteger.class, Long.class);
        addClass2TypeMappings("number(5,0)", Short.class);
        addClass2TypeMappings("number(10,0)", Integer.class);
        addClass2TypeMappings("double precision", Double.class);
        addClass2TypeMappings("varchar(4000 char)", String.class);

        // String
        add(Ops.CONCAT, "{0} || {1}");
        add(Ops.INDEX_OF, "instrb({0},{1})-1");
        add(Ops.INDEX_OF_2ARGS, "instrb({0},{1},{2}+1)-1");
        add(Ops.MATCHES, "regexp_like({0},{1})");
        add(Ops.StringOps.SPACE, "lpad('',{0},' ')");
        
        // Number
        add(Ops.MathOps.CEIL, "ceil({0})");
        add(Ops.MathOps.RANDOM, "dbms_random.value");
        add(Ops.MathOps.LOG, "ln({0})");
        add(Ops.MathOps.LOG10, "log(10,{0})");

        // Date / time
        add(Ops.DateTimeOps.YEAR, "extract(year from {0})");
        add(Ops.DateTimeOps.YEAR_MONTH, "extract(year from {0}) * 100 + extract(month from {0})");
        add(Ops.DateTimeOps.MONTH, "extract(month from {0})");
        add(Ops.DateTimeOps.WEEK, "to_number(to_char({0},'WW'))");
        add(Ops.DateTimeOps.DAY_OF_MONTH, "to_number(to_char({0},'DD'))");
        add(Ops.DateTimeOps.DAY_OF_WEEK, "to_number(to_char({0},'D')) + 1");
        add(Ops.DateTimeOps.DAY_OF_YEAR, "to_number(to_char({0},'DDD'))");
        add(Ops.DateTimeOps.HOUR, "to_number(to_char({0},'HH24'))");
        add(Ops.DateTimeOps.MINUTE, "to_number(to_char({0},'MI'))");
        add(Ops.DateTimeOps.SECOND, "to_number(to_char({0},'SS'))");
        
        setLimitAndOffsetSymbols(false);
        setRequiresWhereForPagingSymbols(true);
        setLimitTemplate("rownum < %1$s");
        setOffsetTemplate("rownum > %1$s");
        setLimitOffsetTemplate("rownum between %1$s and %3$s");
    }
}